Milk ducts can become blocked when the lactating breasts
become very full (engorged) and are not emptied
regularly. A blocked milk duct feels like a tender lump on the breast.
You can treat a blocked duct with self-care measures, such as warm, wet
compresses or showers and massages before breast-feeding. Empty the breast more
effectively by feeding from it first, breast-feeding more often, and using
different nursing holds. Using ibuprofen (such as Advil) to reduce swelling can
help relieve a blocked duct.
A blocked duct can become infected
(mastitis). If you develop signs of a breast infection
(mastitis), you may need to call your health professional right away.